SSL/TLS Certificates
325,744 of the 965,200 top sites in our Tranco top-1M census run Let's Encrypt (33.7%). A free, automated certificate authority that issues and renews SSL/TLS certificates for HTTPS. Detection is homepage-level HTML/header fingerprinting, so a site can run Let's Encrypt on other pages without it showing here.
Other ssl/tls certificates
| # | Domain | Global traffic rank | Contacts |
|---|---|---|---|
| 1 | mail.ru | #12 (Tranco) | Find emails |
| 2 | twitter.com | #17 (Tranco) | Find emails |
| 3 | wikipedia.org | #27 (Tranco) | Find emails |
| 4 | wordpress.org |
| Site | Tranco rank | Also detected | Contacts |
|---|---|---|---|
| ubuntu.com | #235 | Cloudinary, Google AdSense, Google Tag Manager + 1 more | Find emails |
| casalemedia.com | #250 | Cloudflare, Font Awesome, Google Tag Manager + 4 more | Find emails |
| openai.com | #251 | Azure DNS, Cloudflare Bot Management, Cloudflare edge/CDN | Find emails |
| #43 (Tranco) |
| Find emails |
| 5 | x.com | #54 (Tranco) | Find emails |
| linktr.ee |
| #253 |
| Amazon Route 53, Amplitude, Fastly + 5 more |
| Find emails |
| wixsite.com | #258 | Fastly, Google Identity Services, NS1 + 1 more | Find emails |
| launchpad.net | #267 | Gunicorn | Find emails |
| wikimedia.org | #268 | — | Find emails |
| springer.com | #269 | Fastly, Hotjar, Varnish | Find emails |
| doubleverify.com | #272 | Akamai Edge DNS, Cloudflare Bot Management, Cloudflare edge/CDN + 2 more | Find emails |
| ampproject.org | #276 | Google Workspace, Netlify | Find emails |
| telecid.ru | #277 | Nginx | Find emails |
| mozilla.com | #283 | Akamai Edge DNS, Fastly, Sentry + 1 more | Find emails |
| nature.com | #293 | Fastly, Varnish | Find emails |
| myshopify.com | #299 | Cloudflare edge/CDN | Find emails |
| harvard.edu | #300 | Akamai Edge DNS, Google Tag Manager, Nginx + 3 more | Find emails |
| steampowered.com | #303 | Akamai Edge DNS, Nginx, jQuery | Find emails |
| php.net | #312 | Font Awesome, Matomo, jQuery | Find emails |
| launchdarkly.com | #320 | Amazon Route 53, Cookiebot, Google Tag Manager + 4 more | Find emails |
| vk.ru | #324 | — | Find emails |
| opendns.com | #327 | Fancybox, Nginx, jQuery | Find emails |
| slack.com | #328 | Amazon Route 53, Google Tag Manager, OneTrust + 1 more | Find emails |
| gnu.org | #335 | — | Find emails |
| weebly.com | #336 | Amazon Route 53, Cloudflare Bot Management, Cloudflare edge/CDN | Find emails |
| wildberries.ru | #337 | — | Find emails |
| lencr.org | #345 | Cloudflare, Font Awesome, Netlify | Find emails |
Showing the first 10,000matches — add a filter to narrow.
From the Crawlora Website Tech Stack Dataset, a homepage-level fingerprint of a 965,200-domain Tranco top-1M census (run top1m-2026-08-20-full), snapshot August 21, 2026. Directional, not exhaustive — fully custom or bundled stacks under-detect. Methodology →